whispering gallery vs whispering dome

whispering gallery and whispering dome both are nouns.

Word	Noun	Adjective	Verb	Adverb
whispering gallery	Yes	No	No	No
whispering dome	Yes	No	No	No

As nouns, whispering gallery and whispering dome are synonyms defined as:

whispering gallery and whispering dome: a space beneath a dome or arch in which sounds produced at certain points are clearly audible at certain distant points

whispering gallery (noun)	whispering dome (noun)
a space beneath a dome or arch in which sounds produced at certain points are clearly audible at certain distant points	a space beneath a dome or arch in which sounds produced at certain points are clearly audible at certain distant points